Uploaded May 2026 | Updated September 2026, 3 weeks ago

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All my Audi A4 B8 videos: youtube.com/playlist?list=PLXoMfmZDOTAx1lBxhl9hO0-ENulJ1_J0b

In this video I show how to adjust the volume/gain level of different audio sources on the Audi A4 B8 using the hidden Green Engineering Menu.

I originally used this method because the AUX IN volume was much lower compared to the radio or CD source, but the same menu can also be used to adjust other audio input levels depending on your car configuration.

In this tutorial I show:
- how to access the hidden Green Menu
- where to find the audio gain settings
- how to increase or decrease AUX IN volume

This can make a big difference if your Bluetooth adapter, AUX device or external audio source sounds too quiet compared to the factory system.